Planer-head and cutter.



No. 811,768. PATENTED FEB. 6, 1906. J. B. FORBES.

PLANBR HEAD AND CUTTER.

APPLIOA'IIOI rum) JULY 1, 1904.

JOHN B. FORBES, OF MILL VALLEY. CALIFORNIA.

PLANEB-HEAD AND CUTTER- Specification of Letters Patent.

Patented Feb. 6, 1903.

Application filed July 1,1904. Serial H0- 215,032.

To all whom it may concern:

Be it known that I, JOHN BFonnna, a citizen of the United States,residing at Mill Valley, in the county of Marin and State of California,have invented certain new and useful Iin rovcments in Planer-Heads andCutters, oi which the following is a spcciiicatron.

My invention relates to woodworking machinery, and more particularly toplanerheads and cutters.

The object of my invention is to provide a simple rigid construction inwhich very thin cutter-blades can he used to furnish it with means foraccurately adjusting the cutters and securing them in adjustedpositions, to form the head in such a way that wide open threats areprovided adjacent to the cutter, making it easily self-clearing andpreventing choking and clogging by shavings, and in general to improvethe design and construction of such planer-heads in thelines ofsimplicity,

strength, and efficiency.

'In the accompanying drawings, Figure 1 is an elevation of a planer-headwith spiral cutters. Fig. 2 is a cross-section of Fig. 1.

In the drawings, Sdesignates the cutterhead, having proyecting'shaftportions 6 and which is rotatab y journaled and driven 111 any suitableway. This head has a lurality of recesses, the walls 7 and 8 of whictend to converge outwardly to form a dovetail recess to secure cuttersand the securing devices.

In these recesses are fitted the thin cuttens 9, the distanceieccs 12,and the keys or wedges l0, whic fit the conver 'ng surfaces of thecutters and the walls 8. he wall 8 includes a tangential portion 8'. Thewalls 7 are provided with fine corrugations, and the adjacent surfacesof the cutters are formed with similar corrugations. The interengagingcorrugations and ribs thus formed assist in locking the cutters rigidlto the planerhead and at the same time a 0rd along range for veryaccurate adjustment as such cutters wear. Within reasonable limits,which enable the wedges to get agood bearing on the surfaces of. thecutters, the latter can be worn very narrow and still always be capableof being locked in position.

The screws 11 after assing through the solid head in which t icy aresunk bear against or in the distanceieces, the latter formingracticlillyone wal of the dovetail recess. i'h this construction, and asthe holding-screws do not positively enter the wedges themselves, I uardagainst the possibility of longituihna displacement in use bystop-screws 13 at both ends, which are threaded through the ends of thecutter-head, as shown in Fig. l and bear upon the wedges in oppositedirections.

In planers used in woodworking it is a matter of great importance thatthe planerhead and cutters should be easily cleared and prevented fromclogging by accumulating shavings. It will be observed that the distancefrom the cd s of any cutter across the recess to the peri oral arc ofthe head forms a wide throat an clearancespace from which all debris isimmediately discharged.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

1. A planer-head for woodworking, comprising a cylinder provided withdeep eripheral grooves spaced widely apart and avln walls of une ual deth, incombination wit cutters a weihge or ey in each cove ofsubstantially the depth of one we. I, but of less depth than the other,and screw-bolts for securing said wed cs passing substantiallytangentially from t he periphery of the head through the wall of greaterdepth to press said key against the cutter; all constructed and arrangedto provide a wide clearancespace or throat between the cutter and thejunction of the deeper wall with the periphcry of the head.

2. A planer-head for woodworking, comprising a cylinder, having doePBIlPhGIfl-l grooves spaced widely apart and aving walls of .unequaldepth relatively to the periphery of the c linder, the deeper wallconverging outward y towardthe other wall to form a dovetail seat andthen extending to the eriphcry tangentially, in combination wit acutter, a wed e or ey in each dovetail seat and screw-bolls for securingsaid wedges; all constructed and arranged to provide a wideclearance-space or throat between the cutter and the junction of theangular wall with the periphery of the head.

In testimony whereof I have affixed my signature, in presence of twowitnesses, this 9th day of June, 1904.

JOHN B. FORBES.

Witnesses:

F. E. lflon'rnvnnou, M. R. SEELY.

